I have a factory motor of 710kW at 6.6Kv. A VFD will be installed, but I already have a SEL 710 relay above. Would you like to know that only the 50/51 functions are enough for VFD protection?
I have a doubt, I hope you can help me.
My client has a vacuum contactor with a fuse to protect a 1800kW motor, but this fuse was removed and copper bars were installed in its place.
This fuse protects against short circuit, correct? (function 50). If I install a relay with 50/51 functions...
Good morning everyone!
I have a doubt about how the adjustment is made in the RSAS 3750 relay.
Example: TC - 500/5
Ip - timed starting current
scale 1 - 2
steps 0.2
With this I can adjust the KpA / KpB / Kpc to 1/1.2/1.4/1.6/1.8/2
We have the equation Ip = Kp x In
Therefore, if I select 1.2, the...
Good morning, I have a question regarding the RACIC relay (ABB). If I set it to 0.1s, there is a multiplication factor of T=2s. With that my time would be 0.2s?https://files.engineering.com/getfile.aspx?folder=365d70b1-e10b-4ba2-89e1-a4ecf980f138&file=RACIC.png
Hello, I'm having a doubt about the 50 / 51G protection settings. My system has a transformer (138kV - 6.6kV) with an RGB limited to 400A.
All connections are with CT involving the three phases.
Thinking about a protection between two relays what would be the best way to protect the medium...
Hello, I have a question about bus protection. Can I leave the 50N function of my relay 1 disabled? What are the recommended settings for 51N protection?
Can someone please help me about 50 / 51N...
